Mobile Lab: Responsive Testing & Screenshots

Responsive website tester for mobile, foldable, tablet and desktop. Capture screenshots, record QA flows and find frontend issues.

Test responsive websites without juggling dozens of browser windows. Mobile Lab gives developers, designers, QA engineers, freelancers and agencies one Chrome workspace for responsive testing, mobile/foldable preview, breakpoint checks, screenshots, reproducible QA flows and frontend issue evidence. Start with Standard Coverage to compare representative mobile, Android, foldable, tablet and desktop layout risks. Use the 7-width Breakpoint Sweep when you need CSS-width coverage, or choose specific device states from the catalog. Capture evidence: - device and multi-device screenshots; - local save/copy workflow; - local redaction and annotation before sharing; - Pro full-page and advanced evidence workflows. Record a QA flow: - capture navigation and click steps; - retain safe element/action metadata; - keep typed form values out of the recorder; - suppress screenshots for protected password/payment/security fields; - copy or save reproducible QA evidence locally. Results: - Free includes core deterministic responsive/frontend issue evidence; - Pro adds deeper cause/fix/retest guidance, professional exports and agent/developer-ready handoff. Foldables: - test explicit outer/cover and inner/open states; - device descriptors record source/verification status; - candidate CSS viewports are labeled rather than presented as verified physical-device truth. Free Forever: - unlimited core responsive test sessions; - Standard Coverage and 7-width Breakpoint Sweep; - up to 7 simultaneous viewports; - useful current device/foldable coverage; - basic screenshots and local redaction; - core Results; - 3 saved test setups; - 3 saved QA flows, up to 20 steps each; - no account required for core use. Pro: - $7.90/month or $59/year for new v2 subscriptions; - up to 12 simultaneous viewports; - full/current verified catalog as maintained; - unlimited saved workspaces and QA flows within product safeguards; - full-page/advanced capture; - deeper Results, exports and handoff; - up to 2 active personal browser installations per individual user/email. Eligible users can start a 14-day Pro trial after the first successful test. The trial requires email/device verification, does not require a payment card and does not automatically create a paid subscription. Mobile Lab is local-first. Routine screenshots, QA-flow evidence and saved workspaces are not uploaded to our cloud. Optional aggregate extension product telemetry is off until the user explicitly opts in and excludes tested URLs/hostnames, page/DOM content, screenshots, form values, credentials and session recordings. Responsive browser emulation is a fast QA tool, not a claim of physical-device certification. Critical journeys should still be verified on the required real browser/device where necessary. Support: ml.support@marsci.cc Privacy: https://ml.marsci.cc/privacy Terms: https://ml.marsci.cc/terms Refunds: https://ml.marsci.cc/refund Data disclosure: https://ml.marsci.cc/data-disclosure